Avis d’appel d’offres : Peace Winds Japan lance une enquête auprès des consultants au Kenya.

Avis d’appel d’offres : Peace Winds Japan lance une enquête auprès des consultants au Kenya.

Terms of Reference for Hydrogeological Survey

Background

PWJ proposes to undertaking a drought response project to support drought affected communities in Garissa County who are among the most affected by the current drought experienced in Kenya.

Co-ordinated efforts between PWJ, Ministry of Water, Energy, Environment, Climate Change and Natural resources in Garissa County led to the identification of site located in Bulla Banan, Dadaab Sub County in Garissa County as a target site for prospective borehole drilling, Equipping and associated civil works. Bulla Banan is about 3 KM North of Dadaab Town off the Garissa- Liboi Road.

Prior to the development of the new borehole, PWJ intends to engage the services of a hydro-geologist to carry out independent hydrogeological data collection and interpretation/analysis. This is aimed at recommending the prospective drilling sites for the new borehole and submission of an accurate report to guide the drilling process. The consultant is also required to acquire and deliver drilling permit to the client and conduct an Environmental Impact Assessment (EIA).

Objective of the Assignment

The purpose of this Hydro-geological and Geophysical investigation is to carry out and complete an assessment of the proposed borehole site in Bulla Banan, Dadaab Sub County Garissa County then make recommendations for the mechanical drilling of borehole to be undertaken by Peace Winds Japan. This will go a long way to determine groundwater potential within the plot and the possibility of sinking the proposed borehole. The end goal being to establish the optimum location of the borehole suitable to provide water to the community for domestic, agriculture and livestock purposes.

The other objective is to conduct an Environmental and Impact Assessment (EIA) within the target localities to establish possible environmental and social impact for the and sinking of the borehole.

Scope of Work

The Consultant is expected to use both primary and secondary data in the exercise to ascertain ground water potential. Secondary data will involve desk study of available information/data on existing borehole, drill logs, reports and maps while primary data will be obtained by carrying out Hydro-geophysical measurements within the study area using the necessary hydro-geological surveying equipment. The specific activities shall include:

• Sign the terms of reference with the client
• Review of existing data, topographical maps, satellite images, existing studies and borehole site investigations in the area, geological reports and maps (if available), borehole and surface water records, e.t.c
• Mapping out of the water supply and current ground water sources in the vicinity – establishing water demand and taking key information from existing ground water sources to determine ground water potential and water quality
• Hydro-geological fieldwork: Detailed reconnaissance survey of project area. (GPS co-ordinates/P-codes, water level measurements, condition of these borehole, usage and performance where applicable) inspection of geological, geo-morphological and structural characteristics of the investigated area; verification of existing data and findings
• Conduct Hydrology, using up to date tools and equipment to ascertain the hydrogeology of the project area, previous ground water development, aquifer parameters, hydraulic conductivity (K) or the ground flux, ground water discharge, as well as estimating the mean annual recharge.
• To perform profiles in each site using suitable and quick array (wenner or schlumberger methods e.t.c)
• Perform Geophysics relating to basic principles, and do more than three Vertical Electrical Soundings (VES) within the proposed area using the using schlumberger array which distinguishes between clays and fresh water by use of Induced Polarization (IP) measurements.
• Analyze the data aforementioned (hydrogeological/geophysical data) to assess the ground water potential in the project area.
• Make key recommendation on the viability of a borehole to be installed to act as water sources for the Communities.
• Check on site conditions including the availability of space for a drilling rig and other allied machineries to access the project area.
• Select the MOST SUITABLE borehole site within the project area subject to the above results and taking into account the water quality expected and the requirements of the Water Act, WHO, and other line ministries.
• Compile and submit to the client a comprehensive report, which shall include but not limited to all the details of the above investigations. Consultant’s recommendations on the proposed drilling site shall be produced in a soft copy and three hard copies of the geo-survey reports, of which one shall be coloured.
• Apply for Water Resource Authority (WRA) Authorization Permit to drill by obtaining all the requisite documents and data and submitting the application to Water Resource Authority (WRA)
• Obtain Water Resource Authority (WRA) Authorization Permits and delivery to the Client
• Conduct an Environmental and Impact Assessment (EIA) within the target localities to establish possible environmental and social impact for the rehabilitation and solarization of a dam.
• Compile and submit reports with recommendations.